you would have to use special subsonic amo and a very large integral silencer to be practical.
most suppressed rifles around .30 cal are built on mauser actions. but the 8mm bullet is a supersonic very loud round. it really wouldn't be best for what you'd be doing with it, to get a standard round to go subsonic, you'd have to bleed off alot of the gas, its not really a practical idea.
you'd be better off suppressing a mauser action rechambered in something big and slow